Dynex PF500-10 Operating instructions

General Instructions:
Checkball Piston Pumps
High Pressure Hydraulics
D
YNEX
SERVICE
INSTRUCTIONS
SERVICE GUIDELINES
These instructions assume a basic understanding of standard
hydraulic system installation, operating practices and mainte-
nance procedures.
Avoid Contamination
Contamination is detrimental to any hydraulic system.
Absolute cleanliness is essential during servicing and installa-
tion to prevent foreign material from contaminating the pump
and hydraulic system.
Identify the Pump
The pump nameplate is located on the flat surface between
the inlet port and the mounting flange. See FIGURE 1.
This stamped metal tag includes either a ten-digit model
number (i.e., PF2006-1808) or a descriptive model code (i.e.,
PF1002H-SXEA-22-10). The serial number, also stamped on
the plate, can be helpful when communicating with the sales
department.
Confirm Pump Capability
Refer to the published pump specifications. Exceeding the
performance recommendations will reduce operating life.
Contact the sales department for a review of any application
which requires operating above rated pressures or flows, or
beyond the specified speed range.
Checkball hydraulic pumps are axial piston pumps, which use two
check valves in each piston pumping chamber to direct flow from
the inlet side of the pump to the pump outlet port. During operation,
a fixed-angle wobble plate rotates with the drive shaft. The angled
surface imparts a reciprocating motion to the pistons, which move in
and out of the bores in the stationary barrel.
Be Aware of Design Changes
Dynex reserves the right to change designs and specifications
at any time without incurring any obligation. Contact the sales
department if you have any questions about pump operating
parameters, proper installation or operation.
INSTALLATION INSTRUCTIONS
Inlet Pipe/Hose Sizing
1. Recommended maximum inlet fluid velocity is 4 feet per
second (1,2 metres per second).
2. Recommended maximum outlet fluid velocity is 30 feet
per second (9,1 metres per second).
Inlet Conditions
1. Failure to meet minimum inlet pressure requirements will
result in reduced output flow.
IMPORTANT: Refer to the "Minimum Inlet Pressure" table
on page 6.
2. Inlet pressures higher than 10 psi (0,7 bar) require a high-
pressure shaft seal. On most Dynex pump models a high-
pressure seal is an option that must be specified. Refer to
the published pump specifications.
FIGURE 1: Typical pump showing location of nameplate and shaft
rotation tag, adjacent to inlet port. Rotation is indicated only on
pumps which are unidirecional (do not have bi-directional shaft rota-
tion). Refer to "Pump Rotation" on page 2.
PV40
18-2928
123456

FLUID RECOMMENDATIONS
Mineral Oil
A high-grade premium petroleum-
based fluid should be used to assure
long component and system life.
The fluid should have a combina-
tion of anti-wear, demulsibility,
rust protection, oxidation-resistant
and foam-resistant properties.
Special Fluids
Some pump models may require
reduced operating pressures when
using low-lubricity fluids.
Because of the wide range of fluid char-
acteristics, contact the sales depart-
ment for a review of any application
using non-petroleum based fluids.
Viscosity Specifications
Using fluid with the correct viscosity
range is critical to achieving long
component life. Fluid conditions out-
side the “Optimum” range shown in
the table may result in reduced pump
output, requiring pressurized inlet
conditions. For more information,
contact the sales department.
Hydraulic Fluid Viscosity
➀
Operating
Start-up
Pump
Models
Minimum
Optimum
Maximum
SUS
cSt
SUS
cSt
SUS
cSt
SUS
cSt
Fixed Displacement Pumps:
PF500-10
52
8
98 to 324
20 to 70
1911
413
3706
800
PF1000-10
59
10
98 to 324
20 to 70
1911
413
3706
800
PF1300-10
31
1,5
–
–
927
200
927
200
PF2000
59
10
98 to 324
20 to 70
1911
413
1911
413
PF2000
➁
34
2,3
98 to 324
20 to 70
1911
413
1911
413
PF3000-10
59
10
98 to 342
20 to 70
1911
413
3706
800
PF4000-30
34
2,3
98 to 324
20 to 70
1911
413
1911
413
PF4200-10
34
2,3
98 to 324
20 to 70
1911
413
1911
413
PF4300-11
31
1,5
–
–
927
200
927
200
PF6000
34
2,3
98 to 324
20 to 70
1911
413
1911
413
Mechanical Variable Delivery Pumps:
PV4000
34
2,3
98 to 324
20 to 70
1911
413
1911
413
PV6000
34
2,3
98 to 324
20 to 70
1911
413
1911
413
Hydraulic Variable Delivery Pumps:
PV6000
34
2,3
98 to 324
20 to 70
1911
413
1911
413
➀
Fluid conditions outside the “Optimum” range may result in reduced output, requiring
pressurized inlet conditions. Contact the sales department.
➁
Models with special mounting. Refer to "Bulletin PES".
Fluid Guidelines
Contact the sales department when operating with low-
lubricity or non-petroleum based fluids, or beyond the
optimum fluid viscosity range.
IMPORTANT: Refer to “Fluid Recommendations” below.
Port/Fitting Configurations
1. Dynex pumps are available with outlet ports suitable for
use at various pressure ranges. Refer to page 7 for port
descriptions.
2. Contact the fitting manufacturer to ensure the selected
fittings are rated for the maximum pump operating pressure.
Minimum Filtration Levels
1. Pump inlet: 150 µ nominal;
Pressure or return line: 25 µ nominal.
2. While finer filtration levels than these are desirable and
will result in longer component life, restricting flow to the
pump inlet should be avoided. Minimum recommended
inlet conditions must be maintained.
Pump Mounting
1. Mounting with shaft horizontal and inlet vertically up is
preferred. Vertical mounting with shaft up is possible,
but special steps must be followed to bleed air from
housing.
IMPORTANT: Refer to "Air Bleed Procedure" on page 3.
2. Direct drive is recommended.
WARNING: Side loading of the pump shaft, as with an
unsupported pulley/belt drive system, will void the war-
ranty.
3. Connect the pump to the motor drive with a flexible cou-
pling. Maintain angular and radial alignment within the
coupling manufacturer's specifications for your application.
Dynex recommends that the shaft alignment be within
0.005 inch (0,13 mm) TIR. If a rigid coupling must be
used, alignment must be within 0.002 inch (0,05 mm) TIR.
4. The coupling half on the pump shaft must be locked on
the key with a set screw, such that it can not shift and
contact the end face of the pump when operating.
OPERATING RECOMMENDATIONS
Pump Rotation
1.
Variable delivery models with hydraulic volume control
and all fixed displacement models allow bi-directional
shaft rotation, providing constant direction of output
flow regardless of the direction of drive shaft rotation.
2. Variable delivery models with mechanical volume control
(PV4000 Series and Pressure Compensated PV4000 and
PV6000 Series) are unidirectional. The direction of rota-
tion is determined viewed from shaft end and must be
specified when ordering. A plate designating rotation is
mounted on the edge of the mounting flange, adjacent to
the inlet port. Refer to FIGURE 1 on page 1.
2

Gate Valve and Relief Valve
1. Be sure that any gate valve in the system is fully open to
the pump prior to start-up, to avoid restricting flow to the
inlet.
2. A relief valve in the circuit is required to protect against
excessive pressures. The maximum relief valve setting
should be no higher than the maximum intermittent pres-
sure rating of the pump.
Air Bleed Procedure
1. HORIZONTAL MOUNTING WITH INLET UP:
Crack the inlet fitting or remove the plug from the upper-
most bleed port in the pump housing to bleed all air from
pump case. Replace the plug prior to start-up.
2. HORIZONTAL MOUNTING WITH INLET DOWN OR AT
RIGHT ANGLE:
Remove the plug from the uppermost bleed port in housing
to bleed all air from the pump case. Replace the plug prior
to start-up.
3. VERTICAL MOUNTING WITH SHAFT UP (PUMP
EXTERNAL TO RESERVOIR):
Remove the plug from the vertical bleed port (nearest to
mounting flange face) and bleed all air from the pump
case. Replace the plug prior to start-up.
4. VERTICAL MOUNTING WITH SHAFT UP (WITH PUMP
IMMERSED IN FLUID RESERVOIR):
Refer to FIGURE 2.
During installation, remove the plug from the vertical
bleed port (nearest to the mounting flange) and connect
a pipe to the top of the reservoir.
Fill reservoir and allow all air to bleed from pump case.
Replace plug prior to start-up.
IMPORTANT: In all cases, bleed air from the inlet hose
prior to start-up. This air bleed procedure should be fol-
lowed each time the reservoir has been drained and the
pump emptied.
INITIAL START-UP
1. Assure that the pump case is void of air, as described
previously.
2. Ensure all pipes and hoses are secure and that the pump
is in a hydraulically unloaded condition.
3. First jog the electric motor, by quickly turning it on and
off several times, to check that the pump runs smoothly.
Also, check for correct circuit connections and leaks.
4. Then, run the pump at no-load pressure (all valves in an
open, neutral position) for several minutes. Check to be
sure the pump does not leak or develop excessive heat or
noise.
5. If operation is normal, then the pressure can be increased
to the normal operating settings.
If you have problems achieving full flow, first refer to
“Trouble-Shooting” on page 5. If problems continue, contact
the sales department.
FIGURE 2: Bleeding the air on a typical vertical pump installation
inside the reservoir requires connecting a pipe to the top of the tank.
Do not allow the fluid level in the reservoir to drop below the inlet port
during all machine cycles.
PREVENTIVE MAINTENANCE
A systematic maintenance program can help achieve maxi-
mum life for the pump and other system components.
Standard recommended procedures include:
1. Regularly inspect system for leakage, worn or damaged
piping or connections, wear of any moving parts and
secure mounting of all components.
2. Regularly check the system for smooth operation, unusu-
al noise or vibration, excessive temperatures, proper
operating pressures and actuator speeds.
3. Check for proper fluid level in reservoir.
4. Check the condition of the fluid and change the fluid if it
is dirty or contaminated with any foreign matter or water.
Change the fluid regularly as recommended using only
approved fluid.
5. Change filter elements and clean any reservoir filter
screen at recommended intervals.
GENERAL REPAIR INSTRUCTIONS
Parts Lists and Instructions
Refer to separate "Parts List" for the pump model being
serviced. Contact the sales department for availability of
"Maintenance Instructions" with detailed disassembly and
assembly instructions, and for information on any required
special tools.
General Guidelines
1. Before servicing, completely drain fluid from the pump.
Plug all ports. Clean external surfaces using a solvent to
remove dirt and grease. If necessary, use a dull blade to
remove excess paint.
3
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

4
PISTON SHOE
INLET SEAT
INLET CHECKBALL
INLET SPRING
INLET BALL STOP
PISTON
RETAINER
FIGURE 3: Typical piston assembly showing piston shoe and inlet
checkball components inside piston.
checkball components inside piston.
Part Inspection, Evaluation and Reconditioning
Part
Inspection Procedure
Barrel
Check piston bores for galling or
excessive wear.
Outlet Seats
and Checkballs
Using microscope, check for pitting
and excessive wear. Always replace
seats and checkballs as a matching
pair.
Outlet Springs and
Control Springs of
Variable Models
Check for set, worn (end coils and coil
ID) or bent or broken springs. Replace
all springs as standard hydraulic ser-
vice practice.
Piston
Assemblies
(Refer to
Figure 3)
Check for galling on outer diameter of
each piston, damage or wear to piston
shoes, inlet seat pitting or excessive
coining/recession, excessive wear to
inlet ball stop. Confirm inlet checkball
is seating properly (See procedure on
page 5).
Piston Return
Springs and
Spring Retainers
If present, check for excessively worn
or bent springs and worn spring
retainers.
Bearings,
Thrust Plates and
Wobble Plate
Replace if any pitting is present or if
roller/race surfaces have excessive
wear.
O-rings
and Seals
Replace all seals during reassembly,
as standard hydraulic service practice.
Drive Shaft
Check for excessive or abnormal wear.
Face Surface
of Barrel
and Cover
Use a fine-grit oil stone (i.e., India
Medium) to remove any nicks and
ensure flatness on the faces. Replace
if any nicks are near sealing surface.
Thrust Plate
Surface
(Some Models)
Lap the surface of the plate that
contacts the piston shoes. Use several
figure-8 motions on 600 grit wet/dry
paper on a flat plate or stone until
surface is uniform. Replace the
bearing if deep nicks or abrasion
are evident.
2. Absolute cleanliness is necessary while working to pre-
vent contamination and potential pump damage.
3. To aid proper reassembly, note the relative position of the
housing, barrel and cover (some models). Apply a paint
stripe or center punch marks on the external service
across the seams.
4. Be prepared with new seals and o-rings, which should be
installed during reassembly as standard hydraulic service
practice.
IMPORTANT: If a system component fails resulting in fluid
contamination, it is important to drain and clean the reservoir,
all lines, filter screens and all components. Refill the system
with new fluid. This must be done to prevent immediate failure
of new pump when replacing a failed pump.
Disassembly Notes
1. Handle parts with care to prevent nicks and scratches on
critical machined surfaces. As parts are removed and set
aside for inspection, cover them with a clean cloth for
protection.
2. Keep similar, non-identical parts (springs, checkballs,
bearing plates) separated and identified to avoid confu-
sion during reassembly.
3. Be careful when separating the barrel and housing, which
may spring apart in models with spring-loaded parts.
4. To avoid damage, the pistons need to be retained in the
barrel as it is separated from the housing. Tip the barrel
slightly to keep the piston assemblies in place.
5. In some pump models, removal of outlet seats or retain-
ers may be difficult without using a special tool. Contact
the sales department for more information.
If excessive wear requires replacement, it may be more
advantageous to replace the entire barrel.
6. Similarly, if a piston is stuck in the barrel, it is likely that
the piston bore was damaged. Replacement of the entire
barrel is recommended.
Reassembly Notes
1. Replacements for certain parts must be ordered as a kit.
Typically, these include the seals and o-rings, pistons,
outlet check valves, the shaft and bearings, and any
pump control components (i.e. pressure compensator
assembly). Refer to the specific Parts List, or contact the
sales department for kit numbers.
2. During reassembly, coat all parts in pump fluid or com-
patible grease.
3. Replace all seals and o-rings as standard hydraulic practice.
4. To assure correct assembly sequence and orientation,
refer to the marks applied to the external surfaces (See
“General Guidelines”, step 3).
5. When applying adhesive sealant (
Loctite
®
Threadlocker
® Threadlocker ®
,
Threadlocker, Threadlocker
or equivalent), apply enough sealant to coat one or two
center threads. Do not apply excessive sealant that can
seep beyond the thread area.
6. Refer to the specific Parts List for proper torque values
when installing parts.
7. To prevent damaging the seal when installing over the
shaft, the keyway or spline should be masked with thin
tape and coated with grease.
8. Before installing the pistons, check each one to confirm
that the inlet checkball is seating properly. See page 5.

5
CHECKING FOR PROPER SEATING
Confirm that the inlet checkball is seating properly,
using the following procedure:
Set the barrel on a smooth, flat surface, with piston
bores facing up.
Place a small amount of fluid in one of the piston bores
until the bottom is covered. Coat each piston with fluid.
Push each piston into the barrel bore. There should
be resistance from the compressing air trapped in the
bores. If the piston drops straight down with no resis-
tance, the ball is not sealing properly with its seat.
Testing Pump Rotation
Before start-up, look through the inlet port to assure piston
shoes are seated properly. Manually rotate the shaft at least
two revolutions, to ensure that no binding is occurring.
STORAGE AND CORROSION PREVENTION
General Guidelines (All Pumps)
1. Lightly coat the drive shaft with grease prior to long term
storage.
2. Always keep the shipping plugs installed in the ports
during storage and installation, until the unit is ready for
connection to the circuit. This will prevent ingress of dirt
and moisture.
Water Glycol Pumps
1. All external surfaces should be protected prior to expo-
sure to sea atmosphere.
Trouble-Shooting Guidelines
Problem
Cause/Remedy
Low Flow or
No Pump Flow
1. Check fluid level in reservoir to ensure
that suction line is completely submerged.
2. Check inlet line to ensure filter or
screen is clear and valves are open.
3. Check power source and coupling to
ensure that pump is being driven at
proper speed.
4. Check inlet line, fittings and shaft seal
for possible air leaks which would
cause the pump to lose suction.
5. Ensure that air is bled from pump
case and inlet lines.
System
Not Developing
Pressure
1. Check possible causes listed above
for "Low Flow or No Pump Flow".
2. Check the relief valve and any pres-
sure control valves in the circuit for
proper setting and operation.
3. Look for leaks in the system (see
"External Leakage" below).
External
Leakage
1. Replace any worn or damaged pump seals.
2. Check for leaking fittings and other con-
nections. To remedy, apply sealer to pipe
threads, replace o-rings on S.A.E. straight
thread fittings, or replace entire fitting as
needed. Tighten to specified torque values.
Excessive
Heat
1. Check for adequate fluid in the system.
2. Confirm proper fluid viscosity.
3. Check the relief valve pressure setting.
4. Check for cavitation caused by a
break in the suction line. Ensure filter
or screen is clear and valves are open.
Abnormal
Pump Noise
or Vibrating
Pressure Line
1. Check for air or contamination in the
system.
2. Check for misalignment of drive shaft
at power source.
3. Inspect and repair pump as required.
2. All water glycol pumps are filled with an equipment preser-
vative fluid prior to shipment from factory.
When storing for extended periods, keep the pump case
filled with a preservative fluid that has a vapor phase corro-
sion inhibitor ("Canning EPF", or equivalent). Fill the case at
least three-quarters full to cover the pump wobble plate.
After filling the case, rotate the drive shaft several revolu-
tions to distribute the fluid throughout the pump.
3. Install shipping plugs in ports, to prevent contamination.
TROUBLE-SHOOTING
Trouble-shooting pump performance problems varies with
the complexity of the system. It is important to review infor-
mation provided by manufacturers of all components, to have
a complete understanding of how the system operates.

6
Minimum Inlet Pressure
➀
Operating Speed
Pump Models
1200 rpm
1500 rpm
1800 rpm
24
00 rpm
2800 rpm
36
00 rpm
psi
bar
psi
bar
psi
bar
psi
bar
psi
bar
psi
bar
Fixed Displacement Pumps:
PF501 and PF504
0
0
0
0
0
0
0
0
0
0
5
0,4
PF507
0
0
0
0
0
0
0
0
5
0,4
10
➁
0,7
➁
PF510
0
0
0
0
0
0
0
0
10
➁
0,7
➁
15
➁
� 1,0
➁
PF1002
0
0
0
0
0
0
0
0
0
0
5
0,4
PF1003 and PF1004
0
0
0
0
0
0
0
0
5
0,4
10
➁
0,7
➁
PF1005 and PF1006
0
0
0
0
0
0
➂
➂
10
➁
0,7
➁
–
–
PF1007 and PF1008
0
0
0
0
0
0
➂
➂
10
➁
0,7
➁
–
–
PF2007
0
0
0
0
0
0
3
0,2
5
0,4
�–
–
PF2008
0
0
0
0
0
0
5
0,4
–
–
–
–
PF2009
0
0
0
0
0
0
3
0,2
5
0,4
–
–
PF2012
0
0
0
0
0
0
5
0,4
–
–
–
–
PF2000 Series (Special Mounting)
0
0
0
0
0
0
5
0,4
–
–
–
–
PF3011
0
0
0
0
0
0
➃
➃
10
➁
0,7
➁
–
–
PF3015
0
0
0
0
3
0,2
➃
➃
–
–
–
–
PF3017
0
0
0
0
5
0,4
➃
➃
–
–
–
–
PF3021
0
0
0
0
3
0,2
➃
➃
–
–
–
–
PF3024
0
0
0
0
5
0,4
➃
➃
–
–
–
–
PF4011
0
0
0
0
0
0
5
0,4
–
–
–
–
PF4016
0
0
0
0
0
0
5
0,4
–
–
–
–
PF4018
0
0
0
0
5
0,4
10
➁
0,7
➁
–
–
–
–
PF4020
0
0
5
0,4
10
➁
0,7
➁
15
➁
1,0
➁
–
–
–
–
PF4203 and PF4205
0
0
0
0
0
0
–
–
–
–
–
–
PF4208
0
0
0
0
5
0,4
–
–
–
–
–
–
PF4209 and PF4210
0
0
5
0,4
10
0,7
–
–
–
–
–
–
PF6023
0
0
5
0,4
10
0,7
–
–
–
–
–
–
PF6033
0
0
10
0,7
15
1,0
–
–
–
–
–
–
PF6046
0
0
5
0,4
10
0,7
–
–
–
–
–
–
PF6054
0
0
5
0,4
5
0,4
10
0,7
–
–
–
–
PF6070
0
0
5
0,4
10
0,7
➄
➄
–
–
–
–
PF6080
5
0,4
5
0,4
10
0,7
➄
➄
–
–
–
–
Fixed Displacement Pumps for Water-Based Fluids:
➅
All PF1300 Models
0
0
0
0
0
0
–
–
–
–
–
–
PF4303 and PF4304
0
0
0
0
0
0
–
–
–
–
–
–
PF4305 and PF4306
0
0
0
0
0
0
–
–
–
–
–
–
PF4308
0
0
0
0
5
0,4
–
–
–
–
–
–
PF4309
0
0
5
0,4
10
0,7
–
–
–
–
–
–
PF4310 and PF4312
0
0
5
0,4
15
1,0
–
–
–
–
–
–
Variable Delivery Pumps:
PV4018 and PV4026
0
0
5
0,4
5
0,4
10
0,7
–
–
–
–
PV4033
0
0
5
0,4
5
0,4
–
–
–
–
–
–
PV6054
0
0
5
0,4
5
0,4
10
0,7
–
–
–
–
PV6070
0
0
5
0,4
10
0,7
➄
➄
–
–
–
–
PV6080
5
0,4
5
0,4
10
0,7
➄
➄
–
–
–
–
Pressure Compensated Pumps:
PV4000 Series
0
0
5
0,4
5
0,4
–
–
–
–
–
–
PV6046 and PV6054
0
0
3
0,2
5
0,4
–
–
–
–
–
–
PV6070
3
0,2
8
0,6
10
0,7
–
–
–
–
–
–
PV6089
5
0,4
10
0,7
15
1,0
–
–
–
–
–
–
➀
Values shown are based on fluid viscosity of 100 SUS (20 cSt) mineral oil, except pumps for water-based fluids as indicated.
➁
Inlet pressures higher than 10 psig (0,7 bar) require a high-pressure shaft seal.
➂
Minimum inlet pressure: 5 psi (0,4 bar) at 2200 rpm.
➃
Minimum inlet pressure for Model PF3011: 5 psi (0,4 bar) at 2200 rpm and 7 psi (0,5 bar) at 2500 rpm; for Models PF3015 and PF3021: 7 psi (0,5 bar) at 2200 rpm
and 10 psi (0,7 bar) at 2500 rpm maximum speed; for Models PF3017 and PF3024: 10 psi (0,7 bar) at 2200 rpm maximum speed.
➄
Minimum inlet pressure for Models PF6070 and PV6070: 10 psi (0,7 bar) at 2300 rpm maximum speed; for Model PF6080 and PV6080: 15 psi (1,0 bar) at 2200 rpm
maximum speed.
➅
Values shown are based on fluid viscosity of 33 SUS (1,9 cSt) water glycol fluid. Higher viscosity fluids may require pressurized inlet conditions then indicated.
Values shown are based on fluid viscosity of 33 SUS (1,9 cSt) water glycol fluid. Higher viscosity fluids may require pressurized inlet conditions then indicated.

PORT DESCRIPTIONS
Dynex pumps are available with outlet ports suitable
for use at various pressure ranges. Contact the fitting
manufacturer to ensure the selected fittings are rated for
the maximum pump operating pressure.
S.A.E. Straight Thread Ports
The Straight Thread connection (S.A.E. J1926/1) is
sometimes referred to as an S.A.E. o-ring boss, or ORB.
The port consists of a machined spotface surface, a
tapered seal cavity and a straight thread port.
The fitting forms a seal by compressing the o-ring in the
seal cavity with the underside of the flanged wrench flat.
Some adjustable fittings, such as elbows and tees, use a
locknut with a captive backup washer for compression.
S.A.E. Straight Thread ports are not recommended for
operation above 8000 psi (560 bar). Also, the maximum
pressure of pumps with No. 12 S.A.E. outlet ports may
be limited by the pressure rating of the available fitting.
Contact the fitting manufacturer for ratings.
Coned and Threaded Ports
High-pressure pumps are available with coned and
threaded outlet ports, which use Autoclave Medium
Pressure, Butech M/P, or equivalent fittings.
These fittings provide a metal-to-metal seal with an
interference fit, not requiring an o-ring. The gland nut
holds the sleeve and tubing against the cone surface.
A weep hole, visible on the outside of the pump cover,
acts as an indicator of any abnormal leakage caused by
system conditions (i.e., excessive pressure). It allows
any fluid which does leak past the sealing surfaces to
escape, preventing pressure build-up and possible damage.
7
PUMP
CO
VER
O-RING
COUPLING
Typical S.A.E. Straight Thread port connection
Typical British Standard Pipe (parallel fitting
with shoulder) port connection
PUMP
CO
VER
COUPLING
SEAL RING
SHOULDER
O-RING
PUMP
CO
VER
FLANGE
BOL
TS
BOLTSBOL
Typical S.A.E. 4-Bolt Flange port connection
WEEP
HOLE
GLAND NUT
TUBING
SLEEVE
PUMP
CO
VER
Typical Coned and Threaded port connection
British Standard Pipe Ports
High-pressure pumps are available with flat face ports
with British Standard Pipe (B.S.P.) parallel threads (BS
2779 or ISO 228), ideal for use on some European appli-
cations.
The fitting forms a seal by compressing a flat elastomer
ring on a machined spotface surface. There are several
sealing methods for these ports.
The recommended fitting has a recessed seal cavity
formed by a shoulder on the underside of the flanged
wrench flat (Voss “Peflex”, Form B Shoulder Seal; or
Parker Type E, “EOlastic” Seal; or equivalent).
B.S.P. ports are not recommended for operation above
10 000 psi (700 bar). Contact the fitting manufacturer,
to ensure the selected fittings are rated for the maximum
pump operating pressure.
S.A.E. 4-Bolt Flange Ports
Flange connections are often used for higher flows
requiring larger diameter tubing. The port consists of an
unthreaded port with four bolt holes in a rectangular pat-
tern on a machined face around the port (S.A.E. J518).
A typical fitting consists of a flanged head with a welded
tube and a captive flange with bolt holes. A seal is formed
by an o-ring in the groove on the underside mounting
surface of the flange head. As the flange bolts are alter-
nately tightened, the o-ring is compressed between the
flange head and the machined face on the pump.
To make mounting easier in tight spaces a two-piece
split-flange is often used.

Copyright
©
Dynex/Rivett Inc. Printed in U.S.A. Bulletin PSI.CB-030
© Dynex/Rivett Inc. Printed in U.S.A. Bulletin PSI.CB-030©
6
European Sales
Dyne
x
/Ri
v
ett Inc.
Unit C5 Steel Close, Little End Road,
Eaton Socon, Huntingdon,
Cambs. PE19 8TT United Kingdom
Tel: +44 [0]
1
480
21
3980
FAX: +44 [0]
1
480 405662
E-mail: [e-mail]
USA Headquarters
Dyne
x
/Ri
v
ett Inc.
770 Capitol Drive
Pewaukee, WI 53072 U.S.A.
Tel: 262-6
9
1
-
2222
FAX: 262
-
6
9
1
-
0
3
12
E-mail: [e-mail]
Power Units & Systems
Dyne
x
/Ri
v
ett Inc.
54 Nickerson Road
Ashland, MA
0
1
721 U.S.A.
Tel: 508-8
8
1
-
5
1
10
FAX: 50
8-
8
8
1
-
6849
E-mail: [e-mail]
For more information
visit our web site:
www.dynexhydraulics.com